Self-piercing snap fastener



April 29, 1924. V 1,492,543

J. W. 'DEWS SELF PIERCING SNAP FASTENER Filed Nov. '2, 1921 Patented Apr. 29, 1924.

JOSEPH W. DEWS, OF WATER/BURY, CONNECTICUT, ASSIGNOR TO ,SCOVILL MANUFAC- TUBING COMPANY, OF WATERBURY, CONNECTICUT, A. CORPORATION OF CONNECTI- CUT.

SELF-PIERCING SNAP FASTENER.

Application filed November 7, 1921. Serial No. 513,371.

T 0 all whom it may concern Be it known that I, Josnrrr W. Dnws, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Comiecticut, have invented a certain new and useful Improvement in Self- Piercing Snap Fasteners, of which the following is a full, clear, and exact description.

This invention relates to that class of snapfasteners for gloves and other articles, in which the parts out holes for themselves in the article in the act of setting, such fasteners being known as self-piercing fasteners. In fasteners of this type the caps are rather thick as compared with the caps of fasteners for which holes have to be preformed; and, moreover, when the self-piercing fasteners are used upon thin or soft material, or articles, there is likely to be some puckering of the material around the fastener.

In the present invention the construction is such that a very thin cap may be used, and the puckering materially reduced, if not entirely avoided.

The invention consists of a self-piercing snap-fastener socket, comprising a cap having an exposed front or outer portion, finished with a cloth or other cover, or otherwise, and a back of inverted frusto-conical form having a cutting edge, and a socket member to engage the stud of a fastener, said socket member having a dome rising from a retaining flange and serving as an anvil over which the glove or other article is placed and upon which the back is pressed to cut a hole for the'fastener, and with which the back engages in order to unite the cap and sockets, as I will proceed now to explain and finally claim.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a cross-section of the front or outer member of the cap; Fig. 2 is a cross section of the back member, and Fig. 3 is a cross-section of the front and back members united and ready for use. Fig. 4: is a cross section of the socket member. Fig. 5 is a cross-section showing the cap and the socket arranged upon opposite sides of a piece of fabric, two thicknesses, ready to be assembled, and Fig. 6 shows the assembly, or the fastener set.

All of the views are greatly enlarge-d.

The front 1 may be a metal shell, adapted to be finished in any suitable way, as by covering it with fabric, as indicated at 2 in Figs. 3, 5 and 6, and having the peripheral flange 3. The back 4 is of frusto-conical form, having the edge 5 rolled as shown, or not rolled as desired, and having a cutting edge 6. The front and back are assembled by closing in the flange 3 about the edge 5, as shown in Figs. 3, 5 and 6.

The socket member 7 has the dome 8 rising from a retaining flange 9, with an intervening neck 10, and an open top, if desired. Such a socket is shown in Fig. 6 of the Hyde and Simons Patent, No. 7 57,196, but in another relation.

The proportions of the edge 6 of the back and the diameter of the dome are such that the dome serves as an anvil over which the fabric or article to which the fastener is to be applied, is placed, and against which the cutting edge of the back is pressed by the setting tool or machine in order to pierce a hole in such article for the interengagement of the cap and socket; the further pressure of the setting tool or machine serving to crowd the cutting edge end of the back into the neck of the socket, without undue deformation of the parts.

Unlike prior constructions of self-piercing fasteners, the socket member, that is to say, the studengaging element, such as part 7, is not provided with a cutting edge, or a closed top acting as a cooperating cutting edge, and the dome of the socket is wholly within the cap when the fastener is set.

The height of the dome and the depth of the back are so short, and the severing action of the back upon the article to which the fastener is applied occurs so quickly after the dome and the back come into contact with the article, and the distance travelled by these two members in order to assemble or connect the cap and the dome is so short, that puckering of the article is almost wholly if not quite eliminated.

The fastener of this invention is designed to be used in connection with a stud or head member of resilient or spring construction.

What I claim is A self-piercing snap-fastener socket member, comprising a cap having a front and a back, said back, being of inverted frustoconical form, the edge of the apexial end being a cutting edge, and a socket provided with back, the said cutting edge of the back at the end of the setting stroke being engaged with and fixed in the neck.

In testimony whereof I have hereunto set my hand this 23d day of March, A. D. 1920.

JOSEPH WV. DEWS.

Witnesses PERCY WARNER, H. B. RIGGS. 

